TY - GEN AU - Mohamed Gamal Ahmed AU - M. R. Moussa , AU - Magda Ragab , TI - Realization of the triple point of mercury on the its - 90 as a primary fixed point / PY - 1997/// CY - Cairo : PB - Mohamed Gamal Ahmed , N1 - Thesis(M.Sc.) - Cairo University - Faculty of Science - Department of Physics UR - http://172.23.153.220/th.pdf ER -